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故障现象:索尼KV—2189TC彩电,近几个月常发生“三无”故障,被他人维修并多次更换行输出管,不敢再修,送我处修理。分析与检修:开机观察故障现象,光栅暗淡,左侧有一条垂直黑竖带,测量+B电压和行输出级电流基本正常,停机用手摸行输出管温度明显偏高,再次开机测量时只听“吱吱”叫声后变为“三无”,经测量行输出管再次损坏。
Symptoms: Sony KV-2189TC color TV, frequent occurrence of “three no” fault in recent months, being replaced by someone else and repeatedly replace the line output pipe, afraid to repair, send me to repair. Analysis and Overhaul: Turn on the machine to observe the fault phenomenon, the grating is dim, there is a vertical black vertical band on the left side, measure the voltage of + B and the output current of the line is basically normal, shut down the temperature of the output pipe of hand touch line is obviously high, Listen to “creak” after the sound into a “three noes”, measured by the output line again damaged.